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NoYes, there are plenty of others, with the best known being the one corresponding to the hexagonal torus. For a list of low-genus congruence subgroups see here. (Sebastian Pauli at UNC Greensboro).
No, there are plenty of others, the best known being the one corresponding to the hexagonal torus. For a list of low-genus congruence subgroups see here. (Sebastian Pauli at UNC Greensboro).
Yes, there are plenty of others with the best known being the one corresponding to the hexagonal torus. For a list of low-genus congruence subgroups see here. (Sebastian Pauli at UNC Greensboro).
No, there are plenty of others, the best known being the one corresponding to the hexagonal torus. For a list of low-genus congruence subgroups see here. (Sebastian Pauli at UNC Greensboro).
